/*全屏切换*/
export function QScreenSwitcher() {
    this.enterFullScreen = function(el) {
        if (el.requestFullscreen) {
            el.requestFullscreen();
        } else if (el.mozRequestFullScreen) {
            el.mozRequestFullScreen();
        } else if (el.msRequestFullscreen) {
            el.msRequestFullscreen();
        } else if (el.webkitRequestFullscreen) {
            el.webkitRequestFullScreen();
        }
    };
    this.exitFullScreen = function(el) {
        if (document.exitFullscreen) {
            document.exitFullscreen();
        } else if (document.mozCancelFullScreen) {
            document.mozCancelFullScreen();
        } else if (document.msExitRequestFullscreen) {
            document.msExitRequestFullscreen();
        } else if (document.webkitExitFullscreen) {
            document.webkitExitFullscreen();
        }
    };
    this.isFullElement = function(el) {
        var realEl = document.fullscreenElement || document.mozFullScreenElement || document.webkitFullscreenElement || document.msFullscreenElement || null;
        return realEl === el;
    };
}